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Bounded quantifier depth spectrum for random uniform hypergraphs
Discrete Applied Mathematics. 2024. Vol. 345. P. 215–225.
The notion of spectrum for first-order properties introduced by J. Spencer for Erdős–Rényi random graph is considered in relation to random uniform hypergraphs. In this work we study the set of limit points of the spectrum for first-order formulae with bounded quantifier depth and obtain bounds for its maximum value. Moreover, we prove zero–one k-laws for the random uniform hypergraph and improve the bounds for the maximum value of the spectrum for first-order formulae with bounded quantifier depth. We obtain that the maximum value of the spectrum belongs to some two-element set.
Podinovskiy V. V., Нелюбин А. П., Автоматика и телемеханика 2026 № 8 С. 110–123
Для многокритериальных задач принятия решений по аналогии с качественной вероятностью введены понятия полной и частичной качественной важности как бинарных отношений, обладающих постулируемыми
свойствами. Предложено новое определение отношения нестрогого предпочтения на множестве вариантов решений, порождаемое качественной
важностью. Исследованы его свойства. Указаны аналитические правила,
позволяющие попарно сравнивать варианты по предпочтительности. Проведено сравнение новых отношений предпочтения с разработанными ранее для задач, ...
Added: September 9, 2026
Podinovskiy V. V., Нелюбин А. П., Автоматика и телемеханика 2026 № 7 С. 113–126
Рассматриваются задачи принятия решений, когда предпочтения оцениваются в порядковой шкале, а возможности реализации значений
неопределенного фактора описываются качественной вероятностью (полной или только частичной). Вводятся определения отношений предпочтения и безразличий на множестве стратегий. Предлагаются простые
решающие правила, позволяющие сравнивать стратегии по предпочтительности, и приводятся иллюстративные примеры. ...
Added: September 9, 2026
Chemical Papers 2026
Benzenoid hydrocarbons are structurally regular aromatic compounds, which makes them well suited for quantitative structure–property relationship (QSPR) studies. This study presents a QSPR analysis of nineteen benzenoid hydrocarbon species using degree-based topological co-indices. We developed a Python program to compute eleven degree-based topological co-indices from molecular graphs and evaluated their ability to explain variations in ...
Added: September 8, 2026
Glutsyuk A., / Series arXiv "math". 2026.
B.Josephson (Nobel Prize, 1973) predicted a tunnelling effect for a system of two superconductors separated by a narrow dielectric (such a system is called Josephson junction): existence of a supercurrent through it and equations governing it. The overdamped Josephson junction is modeled by the family of differential equations on the 2-torus, dθdτ=1ω(cosθ+B+Acosτ), which is known as ...
Added: September 8, 2026
Glutsyuk A., / Series arXiv "math". 2026.
A planar dual billiard is a planar curve γ equipped with a family (σP)|P∈γ of projective involutions of the projective lines LP tangent to γ at P that fix P. A dual billiard is called rationally integrable, if there exists a rational function R(x,y) of two variables (called first integral) whose restriction to each tangent ...
Added: September 8, 2026
Alexandrov A., Glutsyuk A., Journal of Differential Equations 2026 Vol. 465 Article 114178
The overdamped Josephson junction in superconductivity theory can be modeled by the family of dynamical systems on the torus, which is known as the RSJ model. This family admits an equivalent description by a family of second-order differential equations: special double confluent Heun equations. In the present paper, we construct two new families of dynamical systems on ...
Added: September 8, 2026
Glutsyuk A., Inventiones Mathematicae 2026 Vol. 245 P. 977–1058
A caustic of a strictly convex planar bounded billiard is a smooth curve whose tangent lines are reflected from the billiard boundary to its tangent lines. The famous Birkhoff Conjecture, studied by many mathematicians, states that if the billiard boundary has an inner neighborhood foliated by closed caustics, then it is an ellipse. In the paper we study ...
Added: September 8, 2026
Prikhodko Artem, Kubrak D., Compositio Mathematica 2026 Vol. 162 No. 6 P. 1377–1438
In this follow-up paper we show that smooth Hodge-proper stacks over O𝐾 are ℚ𝑝-locally acyclic: namely the natural map between étale ℚ𝑝-cohomology of the algebraic and Raynaud generic fibers is an equivalence. This establishes the ℚ𝑝-case of general conjectures made in D. Kubrak and A. Prikhodko [p-adic Hodge theory for Artin stacks, Mem. Amer. Math. ...
Added: September 7, 2026
Ismailov A., Constructive Approximation 2026
The measure of the positivity set {x ∈ [0; 2π] | f (x) > 0} of a trigonometric polynomial f is bounded from below by the Motzkin density.
We generalize the bound to polynomials in several variables and almost periodic functions.
We then use these generalizations to extend known results on Taikov’s problem. ...
Added: September 7, 2026
Kucheryavyy P., Математические заметки 2026 Т. 2026 № 120 С. 380–401
В работе изучаются перестановки, возникающие при упорядочивании по возрастанию дробных долей произведений элементов фиксированной целочисленной последовательности на вещественный параметр. Исследуется количество различных перестановок, которые можно получить таким образом при изменении этого параметра от нуля до единицы. ...
Added: September 7, 2026
Осипов Д.В., Математический сборник 2026 Т. 217 № 9 С. 130–146
Изучаются законы взаимности, связанные с комплексными линейными расслоениями на расслоениях на ориентируемые окружности. В частности, доказывается следующий закон взаимности. Пусть B – комплексное многообразие и πi:Mi→B – расслоение на ориентируемые окружности, где индекс i пробегает конечное множество. Пусть Li и Ni – комплексные линейные расслоения на каждом многообразии Mi. Закон взаимности утверждает, что сумма всех элементов (πi)∗(c1(Li)∪c1(Ni)), где (πi)∗ – ...
Added: September 3, 2026
Basalaev A., Rarovskii A., Journal of Singularities 2026 Vol. 30 P. 61–80
Saito theory associates to an isolated singularity rich structure that plays an important role in mirror symmetry. In this note we construct Saito theory for A and D type Landau-Ginzburg orbifolds. Namely, for the pairs (f,G), where f defines an isolated singularity of A and D type and G is a group of symmetries of ...
Added: September 1, 2026
Rybakov M., Shkatov D., Journal of Logic and Computation 2026 Vol. 36 No. 6 Article exag026
We prove Pi-1-1-hardness, and thus lack of recursive axiomatizability, of constant-domain modal predicate logics defined by a class of Dedekind complete linear Kripke frames containing a frame with an infinitely increasing chain of worlds. The result holds even for the language with one unary predicate letter, one propositional letter, and two individual variables. ...
Added: September 1, 2026
Селянин Ф. И., Moscow Mathematical Journal 2026 Vol. 26 No. 2 P. 167–187
Minkowski mixed volume of n subpolytopes D1,…,Dn of a polytope P⊂Rn clearly does not exceed the normalized volume n!Vol(P). Equality holds if and only if the subpolytopes are interlaced, i.e., each proper face F⊊P intersects at least dim(F)+1 of the polytopes Di. Efficiently computing mixed volumes for more general collections of subpolytopes is crucial for estimating the complexity of numerically solving polynomial systems.
Motivated by relaxing the bound dim(F)+1 to dim(F), we ...
Added: August 31, 2026
Kazaryan M., Dunin-Barkowski P., Bychkov B. et al., International Mathematics Research Notices 2026 Vol. 14 Article rnag146
We prove a recent conjecture of the fourth named author with P. Norbury that states a system of universal polynomial relations among the kappa classes on the moduli spaces of algebraic curves. The proof involves localization and materialization analysis of the spin Gromov–Witten theory of the projective line and is dictated by Z 2 -equivariant ...
Added: August 31, 2026
Tiapkin D., Shabanov D. A., Доклады Российской академии наук. Математика, информатика, процессы управления (ранее - Доклады Академии Наук. Математика) 2023 Т. 512 № 1 С. 52–57
The paper deals with the structure of the set of panchromatic colorings with three colors of a random hypergraph in the uniform model $H(n,k,m)$. It is well known that the property of the existence of a panchromatic coloring with given number of colors $r$ has the sharp threshold, i.e. there exists the threshold value $\widehat{m}_r=\widehat{m}_r(n)$ ...
Added: November 30, 2023
Zakharov P., Shabanov D. A., Успехи математических наук 2023 Т. 78 № 6 (474) С. 183–184
We obtain very accurate estimates for the threshold probability of fractional (4:2)-colorability property in a random k-uniform hypergraph in the binomial model H(n,k,p). ...
Added: November 30, 2023
Alina Khuzieva, Matveeva T., Dmitry Shabanov, Moscow Journal of Combinatorics and Number Theory 2023 Vol. 12 No. 1 P. 57–88
The paper deals with strong r-colorings of a random k-uniform hypergraph in the binomial model H(n,k,p). A vertex coloring is said to be strong for a hypergraph if any two vertices that share a common edge are colored with distinct colors. We consider the sparse case when the expected number of edges is equal to cn and the values r≥k≥3, c>0 remain constant ...
Added: April 10, 2023
Демидович Ю. А., Shabanov D. A., Теория вероятностей и ее применения 2022 Т. 67 № 2 С. 223–246
Работа посвящена изучению предельной концентрации значений хроматического числа случайного гиперграфа в биномиальной модели H(n,k,p). Доказано, что при фиксированном k>2 и не слишком быстро растущем значении n^{k-1}p хроматическое число H(n,k,p) с вероятностью, стремящейся к 1, принадлежит множеству из некоторых двух соседних значений. Кроме того, показано, что при чуть более сильных ограничениях на рост n^{k-1}p данные значения ...
Added: January 11, 2023
Matushkin A. D., Popova S., Discrete Mathematics 2022 Vol. 345 No. 6 Article 112835
In this work we describe the spectra of all rational numbers that could be a density of a strictly balanced uniform hypergraph. We also introduce some specific constructions of strictly balanced uniform hypergraphs, and exploit them to generalize some results about Zero-One Law and Zero-One k-Law to the case of random uniform hypergraphs. ...
Added: June 29, 2022
Денисов И. О., Shabanov D. A., Дискретная математика 2021 Т. 33 № 4 С. 32–46
The paper deals with asymptotic behavior of the general independence numbers of random hypergraphs in the binomial model. We prove that there is a concentration of the values of the independence numbers in two consecutive numbers under the certain conditions on the parameters. ...
Added: April 20, 2022
Zakharov P., Shabanov D. A., Доклады Российской академии наук. Математика, информатика, процессы управления (ранее - Доклады Академии Наук. Математика) 2021 Т. 501 С. 26–30
This paper deals with the problem of finding the max-cut for random hypergraphs. We consider the classical binomial model H(n,k,p) of a random k-uniform hypergraph on n vertices with probability p=p(n). The main results generalize previously known facts for the graph case and show that in the sparse case (when the expected number of edges ...
Added: April 20, 2022
Demidovich Y., Shabanov D. A., , in: Recent Developments in Stochastic Methods and Applications: ICSM-5, Moscow, Russia, November 23–27, 2020, Selected ContributionsVol. 371.: Springer, 2021. P. 190–203.
Added: September 23, 2021
Shabanov D. A., Zakharov P., , in: Extended Abstracts EuroComb 2021: European Conference on Combinatorics, Graph Theory and ApplicationsVol. 14.: Cham: Birkhäuser, 2021. P. 817–822.
The paper deals with the max-cut problem for random hypergraphs. We consider a binomial model of a random k-uniform hypergraph H(n, k, p) for some fixed k≥3k≥3, growing n and p=p(n)p=p(n). For given natural number q, the max-q-cut for a hypergraph is the maximal possible number of edges that can be properly colored with q colors under the same coloring. Generalizing the known results for graphs ...
Added: September 8, 2021